// Defines variant class ScreencastId that combines WindowId and DesktopId.

#ifndef MEDIA_BASE_SCREENCASTID_H_
#define MEDIA_BASE_SCREENCASTID_H_

#include <string>
#include <vector>

#include "base/window.h"
#include "base/windowpicker.h"

namespace cricket {

	class ScreencastId;
	typedef std::vector<ScreencastId> ScreencastIdList;

	// Used for identifying a window or desktop to be screencast.
	class ScreencastId {
	public:
		enum Type { INVALID, WINDOW, DESKTOP };

		// Default constructor indicates invalid ScreencastId.
		ScreencastId() : type_(INVALID) {}
		explicit ScreencastId(const base::WindowId& id)
			: type_(WINDOW), window_(id) {
		}
		explicit ScreencastId(const base::DesktopId& id)
			: type_(DESKTOP), desktop_(id) {
		}

		Type type() const { return type_; }
		const base::WindowId& window() const { return window_; }
		const base::DesktopId& desktop() const { return desktop_; }

		// Title is an optional parameter.
		const std::string& title() const { return title_; }
		void set_title(const std::string& desc) { title_ = desc; }

		bool IsValid() const {
			if (type_ == INVALID) {
				return false;
			} else if (type_ == WINDOW) {
				return window_.IsValid();
			} else {
				return desktop_.IsValid();
			}
		}
		bool IsWindow() const { return type_ == WINDOW; }
		bool IsDesktop() const { return type_ == DESKTOP; }
		bool EqualsId(const ScreencastId& other) const {
			if (type_ != other.type_) {
				return false;
			}
			if (type_ == INVALID) {
				return true;
			} else if (type_ == WINDOW) {
				return window_.Equals(other.window());
			}
			return desktop_.Equals(other.desktop());
		}

		// T is assumed to be WindowDescription or DesktopDescription.
		template<class T>
		static cricket::ScreencastIdList Convert(const std::vector<T>& list) {
			ScreencastIdList screencast_list;
			screencast_list.reserve(list.size());
			for (typename std::vector<T>::const_iterator it = list.begin();
				it != list.end(); ++it) {
					ScreencastId id(it->id());
					id.set_title(it->title());
					screencast_list.push_back(id);
			}
			return screencast_list;
		}

	private:
		Type type_;
		base::WindowId window_;
		base::DesktopId desktop_;
		std::string title_;  // Optional.
	};

}  // namespace cricket

#endif  // MEDIA_BASE_SCREENCASTID_H_
